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    <title>窗口A</title>
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    <h1>窗口A-请打开调试工具查看日志</h1>
    <button id="btn1">打开窗口B</button>
    <button id="btn2">设置窗口B尺寸：[400, 400]</button>
    <button id="btn3">发起窗口B请求B1</button>
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